Glass-drawing apparatus.



UNITED STATES PATENT OFFICE.

HAiBRY G. SLINGLUFF. OF MOUNT VERNON. OHIO, A SSIGNOR T0 PITTSBURGH. PI JATE GLASS COMPANY, OF PITTSBURGH PENNSYLVANIA. A CORPORATION OF PENN- SYLVANIA.

Specification of, Letters Patent.

GLASS-DRAWING APPARATUS.

Patented Jan. 1, 1918.

. Application filed May 16.1916. Serial No. 97,797.

' To all whom "it may concern lie it known that l, ll;\nnY (i. Sustaining a citizen of the United States, residing at Mount \Ternoin in the county of hnox and State of Ohio, have inventedcertain new and useful Improvel'l'ients in (ilassUrawing Apparatus, of which the following is a specification. r p

The invention relates to apparatus for drawing glass in sheets from a batch of molten glass. It has for its primary object the provision of an improved constrin-tion for controlling the draw at the edges under the varying conditions in the furnace; and the provision of improvedmeans tor apply ing a cooling fluid at the edges of the glass sheet to secureni stifl'ening of the glass at such points such as will preventa pulling in of, the edges. One embodiment of the invention is illustrated in the accompanying drawings, wherein Figure 1 is a section through my improved apparatus; Fig. 2 is a plan view of the drawing member; Fig. 3 is a section through the apparatus at, right angles to that of Fig. 1; and Fig. 4 is an enlarged perspective View of' one of the drawing blocks carried by the drawing member.

Referring to Figs. 1 and 3, the reference numeral 1 designates,adrawing extension in communication with a melting tank and carrying a glassbath 3; 4 is the drawing member preferably floating in the bath; and 5, 5 arev drawing blocks mounted for vertical adjustment in the member 4. I The members are provided at their upper ends with flanges 6 and are held at any desired height. by means of refractory blocks 7 fitting under the flanges. A series of blocks? may be employed of varying thickness in order to give different vertical adjustments of the blocks Each block 5 is provided with-an extension or shelf 8. (Fig. 4) having its upper face groovcd. asindieatod at 9. This groove 1s extci'ided' in the formoi a circular openmg 10 leading into the interior of the block,

and the adjustment of the block is such that at the edges of the sheet. the amount of air T can control the position ing 13 is an air supply pipe 13 through which air may he directed into the passage 12. the amount being controlled by means of a valve 14. p

The drawing member 4 is provided with an elongated opening 15 (Fig. into which the ledges 8 project, and the glass sheet-16 is drawn from the opening 15 with itsed'ges above the shelves 8. as indicated in Fig, 1. Any desired form of bait 17 may beenr ployed, and the handling the glass sheet as it is elongated beyond the length indicated in Fig. 1 may be accomplishtal in various Ways and has nothing to do with the present invention which'relates to the initial formation of the sheet. v 1 I find that by the use of the shelves 8 and the air passages in the blocks 53,. I can control the formation of the edgesof the sheet of glass. The tendency of the edges is to draw in toward the center of the sheet but this is overcome-bv cooling the edges rapidly and is securedsby the use of the air which flows down through the passages 12 and then laterally through the passages .10 cooling the glass in the grooves 9 and also the edges of the sheet as it is formed, such edges assuming the form as indicatedat- 18 (Fig. 1). It, by reason of changes oftentperature in the glass bath or forehearth, the

edges of the sheet start to draw. in, *this tendency can be overcome by opening-the valves 14 farther and permitting a greater flow of air and a greater cooling of the glass By regulating of the glass edges, thus keeping the sheet of exactly the proper width and preventing any interruption of the drawing.

The length of the ledges 8 may be varied -to suit rerpiirements. and theirestensionbe neath the edges of the sheet assists ma- 1 teriallv in keeping such edges and thci'glass thereabove at the proper temperat are, since the ledges act as shields and pre\'entthe glass at the edges of the sheet from b'eronik ing too hot and fluid. "lhedriuving isiljlus- 'trated as occurring from a forehearth. but

jtis ohiiiouslyiirnmatgrial in,:-sofar as the presentin 1 ion' isctincerned;xwl at form of gl ass bath-"or furnace eonstruetioii is 'employed. The making ofthe, drawingiblocks 5 separate from ,the drawing member 4 isadv'antageous in that adjustment is permitted and in that the blocks '5 may be re- 35 inthe molten glass and extendin laterally drawin newed without replacing the entire drawing member as would be the-case if the drawing blocks were made integralwith the drawing member.- The drawing from the slot rather than from two entirely independent blocks has the advantage that the body 0- glass in the slot 15 is segre ated from the main body of glass and're need in temperature, and impurities are prevented from floating alon the surface and bein' brou htup with t e. sheet such as r the draw, and size of the cooling passages wou d be t e case if the sides of the slot were omitted and the two ends located indev 'endently of each other in the glass batch.

nder certain conditions the air supply from the pipe 13 may be dispensed with entirely, such conditions involving the temperature ofj'the glass bath, the rapidity of The various advantages incident to my construction will be apparent to those skilled in the art.

What I claim is:

1. In glass drawing apparatus employing a glass bath from which a sheet of glass is to be drawn, refractory means at the edges of the glass provided'with passages lying in'th'e molten glass. and extending laterally from the edges of the sheet and then downwardly and adapted to supply molten glass to'thcsheet at the edges thereof. V

2. In glass drawing apparatus employing a glass bath from which a sheet of glass is wardly and adapted to supply molten glass to: be drawn, refractory-means atthe edges of theglass provided with passages lying fromthe edges of the sheet and t en downto the sheet at the edges t ereof; and projecting portions on the refractory means extending beneath thp edges of the sheet.

3. 'In glass-drawing apparatus employing -a glass bath from which a sheet of glass is -to be drawn, refractory means at the edges of the sheet provided with projecting ledges lying beneath the edges of'the sheet belng drawn, and provided withfpassages whereby a flow of, air may bedirected. against the edges of thesheet adjacent the surface of the glass bath. p

4. In glam'dra'wing apparatus employing a glass bath from which a sheet of'glassis to be drawn, refractory means at the edges of the sheet provided with projecting ledges lying beneath the edges of the sheet being drawnyand means for applying a cooling medium.to the edges of the glass adjacent 'the'ledges, i

5; In glass drawin apparatus employing a lassbath from w ich a sheet of glass is todie drawn, refractorymeans at'the edges ofithe" sheet provided with grooved project-'- ing ledges lying beneath the sheet-being the ledges.

separate blocks mounted'at the ends of the a glass bath from which a sheet of glassis to be drawn a refractory block in the glass havinga-n elongated drawing opening, and

sheet being drawn,'.and (also p'rovidedwithpassages whereby" air may be directed 'is to be drawn, refractor -'edges of the sheet 'prbvi edwith later-a passages to cause a drawn, and means for applying a cooling medium to the edges of the. glass adjacent the ledges.

6'. In glass drawing apparatus" employing a glass bath from which a sheet of glassis to be drawn, refractory means at the edges of the sheet provided with grooved projecting ledges lying beneath the sheet being drawn and plrovided with passages in alinement with t e groovesjfor applying a cooling medium to the edges of the glass above 7 In glass drawing apparatus em' 10 in a glass bath from which a sheet of glaiis ii to be drawn a refractory block in the glass having an elongated drawin opening, and separate blocks mounted at t e ends" of the' opening and provided with drawin ledges adapted to lie beneath the edges of t e glass sheet being drawn.- r

8; In glass drawing apparatus employing a glass bath from which a sheet-of glass isv to be drawn, a refractory block in the glass having an elongated drawing opening, and

opening and provided with drawin ledges adapted to lie beneath the edges of t 1e glass sheet being drawn, the said separate blocks being adjustable vertically.

' 9. In glass drawing apparatusemploying separate blocks mounted at the. ends of the opening and provided with drawingl ledges adapted to lie beneath the edges of t e glass against the edges'of. the sheet above the said ledges.

10. In glass drawing apparatus employing a glass bath from which a sheet of glass means at'the passages at the surface of the glass artially filled. thereby, and means for sup ying air 'I through the unfilled portions o the assages laterally against the edges of the s set beingdrawn; dr is 1 11. In' lass awing a paratus emp oying a las% bath from whidli a sheet'of'gl as's -v i is to e drawn, refractory means at the edges ofthe sheet providedwithlateral "passa es" atthe surface of the glass partially mid-thereby and withdownw'ardly exten ing passages communicating with the first passages and with the glass bath beneat and means for supplying air to the sai ow of air through the lateral passages and against the edges of the glass sheet being drawn. a v

HARRY Gi sLINGnoFF. 

